The LG UF6800 UHD TV uses a less accurate 4k pixel structure known as RGBW. While it does have the correct number of pixels, it is missing some colored sub-pixels. Most people won't see the difference, though. Apart from this issue, it is an average LG LED TV.
- Good color accuracy when viewed from the side.
- Uses the less accurate RGBW 4k structure. It does have the correct number of pixels, but some are missing color sub-pixels. This is not really noticeable, though, under normal circumstances.
- Poor contrast ratio.
- A lot of reflection.
The LG UF6800 LED TV looks like most other LG TVs of 2015. It has a wide stand, which could be a limitation if you have a small table.
- 11% Contrast
- 4% Black Uniformity
- 6% Local Dimming
- 6% HDR Peak Brightness
- 6% SDR Peak Brightness
- 6% Gray Uniformity
- 7% Viewing Angle
- 4% Pre Calibration
- 1% Post Calibration
- 6% 480p Input
- 9% 720p Input
- 11% 1080p Input
- 6% 4k Input
- 4% Color Gamut
- 4% Color Volume
- 2% Gradient
- 1% Image Retention
- 6% Reflections
- 1% 3D
It isn't very good for watching movies, especially in a dark room. The blacks are really poor, so the picture will look washed-out and not very uniform. At least it is able to play Blu-ray movies without any judder.
The LG UF6800 has an IPS panel, like most other LG TVs. The contrast ratio is low, and in line with most other IPS TVs.
For an IPS TV, the blacks are more uniform than average, but every small defect is amplified, due to the poor blacks.
The gray uniformity is average. The edges are darker, and you can see a few horizontal whiter bands on the screen, but nothing outrageous.
The best thing about this TV is its color accuracy at an angle, due to its IPS panel. Note that while the colors remain fine, the blacks don't (especially at a vertical angle).
Update 01/06/2017: We have changed the methodology of testing. Since this is an old TV which we don't have anymore, we extrapolated the results from 2016 TVs.
Direct reflections have a rainbow around them.
The luminosity is very limited. Also, when exposed to a lot of light, the screen has a yellow tint.
At least, this LG TV isn't bad for sports. The motion blur trail isn't long, and while you can see some darker spots on grass fields, it is not worse than normal for an LED TV.
The motion blur is average. It shouldn't be an issue for sports, but it is not ideal for gaming.Note: Due to the very aggressive PWM even at 100% backlight, our response time measurement is less accurate on this TV.
It supports a 24p input signal without issues. However, if it is sent over 60p or 60i, it can't reliably do the reverse 3:2 pulldown. It is a 60Hz TV, but it also has the optional soap opera effect, which you can turn on via 'TruMotion'. That feature won't look as smooth as on a 120Hz TV, though.
The input lag is average-high, and could cause some issues for some gamers. The good news is that, as long as you have 'TruMotion' off, it doesn't matter which mode you are in to get that input lag.
- 20% 1080p @ 60Hz @ 4:4:4
- 20% 1080p @ 120Hz
- 20% 4k @ 30Hz @ 4:4:4
- 20% 4k @ 60Hz
- 20% 4k @ 60Hz @ 4:4:4
It doesn't support gaming at 120 fps. It does display chroma 4:4:4 at 4k and 60Hz if you turn on 'HDMI Ultra Color' and label the input as PC. However, the text still won't be 100% clear because it is not a 'full' 4k TV. More details in the Q&A section.
Decent low-end for a TV, but the frequency response and loudness are poor. Pumping may also be present under heavy load.
Good and even distortion results across all volumes, but the TV doesn't get loud.
This LG is a smart TV, and it comes with the latest WebOS, which is great. It only has a very basic remote, though, so it is not as easy to navigate as on the other LG TVs. It also has a more limited number of inputs.
You can read our overview of LG's WebOS here.
Conclusion CHECK PRICE
For most people, the fact that the LG UF6800 is using the less accurate 4k panel structure RGBW won't be a big deal. It is hard to tell the difference when watching normal content, even when sitting close. The bigger issues are the average-high input lag (for gaming), the poor contrast (for movies in a dark room) and the significant amount of reflection (in a bright room). At leas, it is able to maintain good color saturation off-axis.
Questions & Answers
The pixel substructure is really interesting on the LG UF6800. It is a 4k TV, but some pixels are white. So, (RGB, RGB, RGB, RGB) becomes (RGB, WRG, BWR, GBW), which means instead of 33% R, 33% G, 33% B, it is 25% R, 25% G, 25% B, 25% W.
The following pictures show a closeup shot when displaying a pure white screen on the UF6800 and the UF7600.
The pixel substructure is a bit more noticeable when we display a purplish white:
To show what is addressable, here is a pale purple diagonal line.
The above picture also show that there is some overlap between pixels on the UF6800. Probably to better hide the fact that some pixels are different than others.
With normal picture, though, this isn't that big of a deal:
It is very hard to tell the difference, even up close.
It is a bigger deal when using it as a computer monitor, because the text will look a bit strange:
Like the UF7600 that we tested, our UF6800 suffered from image retention. Even when we only left a slide up for less than a minute, the next slide will get the superposition for a few minutes. This isn't something to worry about, unless you plan on using the TV as a computer monitor where some parts of the screen will stay fixed for long period of time (in this case, the static portions could become almost permanent).
This kind of approach lets LG create a look that is similar to genuine UHD resolution (but isn't quite the same), and for cheaper. We haven't seen, or heard anything about, any other TVs like this thus far.
The tap test isn't reliable. A closeup picture of the pixels works better (unless for PLS, a subtype of IPS, which have rectangle pixel shapes, which can be confused with VA).